Nissan Murano Z50 (2003 year). Manual

ENGINE CONTROL SYSTEM

EC-49

Revision; 2004 April

2003 Murano

●

Type31

●

Type32

INPUT/OUTPUT SIGNAL CHART

T: Transmit R: Receive

SKIA4932E

SKIA4933E

Signals

ECM

TCM

Low

tire

pres-

sure

warn-

ing

con-

trol

unit

Dis-
play

unit

Dis-
play

con-

trol

unit

BCM

Uni-

fied

meter

and
A/C

amp.

Steer

ing

angle

sen-

sor

Drive

r seat

con-

trol

unit

AWD

con-

trol

unit

ABS

actu-

ator
and

elec-

tric

unit

(con-

trol

unit)

IPDM

E/R

Engine and CVT integrated control
signal

Second position signal

VDC operation signal

Stop lamp switch signal

Key switch signal

Ignition switch signal

P range signal

EC-50

ENGINE CONTROL SYSTEM

Revision; 2004 April

2003 Murano

Closed throttle position signal

Wide open throttle position signal

Second position indicator signal

Engine speed signal

Engine status signal

Engine coolant temperature signal

Accelerator pedal position signal

Fuel consumption monitor signal

CVT self-diagnosis signal

Input shaft revolution signal

Output shaft revolution signal

Air conditioner switch signal

A/C compressor request signal

A/C compressor feedback signal

Blower fan motor switch signal

A/C control signal

Cooling fan speed request signal

Position lights request signal

Low beam request signal

Low beam status signal

High beam request signal

High beam status signal

Front fog lights request signal

Vehicle speed signal

Sleep request 1 signal

Sleep request 2 signal

Door switch signal

Turn indicator signal

Key fob ID signal

Key fob door unlock signal

Seat belt buckle switch signal

Oil pressure switch signal

Buzzer output signal

Fuel level sensor signal

Signals

ECM

TCM

Low

tire

pres-

sure

warn-

ing

con-

trol

unit

Dis-
play

unit

Dis-
play

con-

trol

unit

BCM

Uni-

fied

meter

and
A/C

amp.

Steer

ing

angle

sen-

sor

Drive

r seat

con-

trol

unit

AWD

con-

trol

unit

ABS

actu-

ator
and

elec-

tric

unit

(con-

trol

unit)

IPDM

E/R

ENGINE CONTROL SYSTEM

EC-51

Revision; 2004 April

2003 Murano

Fuel level low warning signal

Malfunction indicator signal

ASCD SET lamp signal

ASCD CRUISE lamp signal

Front wiper request signal

Front wiper stop position signal

Rear window defogger switch signal

Rear window defogger control signal

Hood switch signal

Theft warning horn request signal

Horn chirp signal

Steering angle sensor signal

Tire pressure signal

Tire pressure data signal

CVT position indicator signal

ABS warning lamp signal

VDC OFF indicator lamp signal

SLIP indicator lamp signal

Brake warning lamp signal

System setting signal

AWD warning lamp signal

AWD lock indicator lamp signal

AWD lock switch signal

Parking brake switch signal

Signals

ECM

TCM

Low

tire

pres-

sure

warn-

ing

con-

trol

unit

Dis-
play

unit

Dis-
play

con-

trol

unit

BCM

Uni-

fied

meter

and
A/C

amp.

Steer

ing

angle

sen-

sor

Drive

r seat

con-

trol

unit

AWD

con-

trol

unit

ABS

actu-

ator
and

elec-

tric

unit

(con-

trol

unit)

IPDM

E/R

BASIC SERVICE PROCEDURE

EC-53

Revision; 2004 April

2003 Murano

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment

ABS004AH

PREPARATION

Make sure that the following parts are in good order.

●

Battery

●

Ignition system

●

Engine oil and coolant levels

●

Fuses

●

ECM harness connector

●

Vacuum hoses

●

Air intake system
(Oil filler cap, oil level gauge, etc.)

●

Fuel pressure

●

Engine compression

●

Throttle valve

●

Evaporative emission system

On air conditioner equipped models, checks should be carried out while the air conditioner is “OFF”.

Checks should be carried out while shift lever is in “N” position.

When measuring “CO” percentage, insert probe more than 40 cm (15.7 in) into tail pipe.

Turn off headlamp, heater blower, rear window defogger.

Keep front wheels pointed straight ahead.

BASIC SERVICE PROCEDURE

EC-55

Revision; 2004 April

2003 Murano

INSPECTION PROCEDURE

INSPECTION START

Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.

Open engine hood and check the following:

–

Harness connectors for improper connections

–

Wiring harness for improper connections, pinches and cut

–

Vacuum hoses for splits, kinks and improper connections

–

Hoses and ducts for leaks

–

Air cleaner clogging

–

Gasket

Confirm that electrical or mechanical loads are not applied.

–

Head lamp switch is OFF.

–

Air conditioner switch is OFF.

–

Rear window defogger switch is OFF.

–

Steering wheel is in the straight-ahead position, etc.

Start engine and warm it up until engine coolant temperature
indicator points the middle of gauge.
Ensure engine stays below 1,000 rpm.

Run engine at about 2,000 rpm for about 2 minutes under no-
load.

Make sure that no DTC is displayed with CONSULT-II or GST.

OK or NG

>> GO TO 3.

>> GO TO 2.

REPAIR OR REPLACE

Repair or replace components as necessary according to corresponding “Diagnostic Procedure”.

>> GO TO 3.

SEF983U

SEF976U

SEF977U

EC-56

BASIC SERVICE PROCEDURE

Revision; 2004 April

2003 Murano

CHECK TARGET IDLE SPEED

With CONSULT-II

Run engine at about 2,000 rpm for about 2 minutes under no-load.

Rev engine (2,000 to 3,000 rpm) two or three times under no-
load, then run engine at idle speed for about 1 minute.

Read idle speed in “DATA MONITOR” mode with CONSULT-II.

Without CONSULT-II

Run engine at about 2,000 rpm for about 2 minutes under no-load.

Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed for about
1 minute.

Check idle speed.

OK or NG

>> GO TO 10.

>> GO TO 4.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

Stop engine.

Perform

EC-63, "Accelerator Pedal Released Position Learning"

>> GO TO 5.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform

EC-64, "Throttle Valve Closed Position Learning"

>> GO TO 6.

SEF978U

CVT:

650

50 rpm (in "P" or "N" position)

SEF058Y

CVT:

650

50 rpm (in "P" or "N" position)

BASIC SERVICE PROCEDURE

EC-57

Revision; 2004 April

2003 Murano

PERFORM IDLE AIR VOLUME LEARNING

Perform

EC-64, "Idle Air Volume Learning"

Is Idle Air Volume Learning carried out successfully?

Yes or No

Yes

>> GO TO 7.

>> 1. Follow the instruction of “Idle Air Volume Learning”.

2. GO TO 4.

CHECK TARGET IDLE SPEED AGAIN

With CONSULT-II

Start engine and warm it up to normal operating temperature.

Read idle speed in “DATA MONITOR” mode with CONSULT-II.

Without CONSULT-II

Start engine and warm it up to normal operating temperature.

Check idle speed.

OK or NG

>> GO TO 10.

>> GO TO 8.

DETECT MALFUNCTIONING PART

Check the following.

●

Check camshaft position sensor (PHASE) and circuit. Refer to

EC-328

●

Check crankshaft position sensor (POS) and circuit. Refer to

EC-322

OK or NG

>> GO TO 9.

>> 1. Repair or replace.

2. GO TO 4.

CHECK ECM FUNCTION

Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but
this is the rarely the case.)

Perform initialization of NVIS (NATS) system and registration of NVIS (NATS) ignition key IDs. Refer to

BL-189, "ECM Re-communicating Function"

>> GO TO 4.

10.

CHECK IGNITION TIMING

Run engine at idle.

Check ignition timing with a timing light.

OK or NG

OK (With CONSULT-II)>>GO TO 19.
OK (Without CONSULT-II)>>GO TO 20.
NG

>> GO TO 11.

CVT:

650

50 rpm (in "P" or "N" position)

CVT:

650

50 rpm (in "P" or "N" position)

CVT:

BTDC (in "P" or "N" position)

EC-58

BASIC SERVICE PROCEDURE

Revision; 2004 April

2003 Murano

11.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

Stop engine.

Perform

EC-63, "Accelerator Pedal Released Position Learning"

>> GO TO 12.

12.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform

EC-64, "Throttle Valve Closed Position Learning"

>> GO TO 13.

13.

PERFORM IDLE AIR VOLUME LEARNING

Perform

EC-64, "Idle Air Volume Learning"

Is Idle Air Volume Learning carried out successfully?

Yes or No

Yes

>> GO TO 14.

>> 1. Follow the instruction of “Idle Air Volume Learning”.

2. GO TO 4.

14.

CHECK TARGET IDLE SPEED AGAIN

With CONSULT-II

Start engine and warm it up to normal operating temperature.

Read idle speed in “DATA MONITOR” mode with CONSULT-II.

Without CONSULT-II

Start engine and warm it up to normal operating temperature.

Check idle speed.

OK or NG

>> GO TO 15.

>> GO TO 17.

15.

CHECK IGNITION TIMING AGAIN

Run engine at idle.

Check ignition timing with a timing light.

OK or NG

OK (With CONSULT-II)>>GO TO 19.
OK (Without CONSULT-II)>>GO TO 20.
NG

>> GO TO 16.

16.

CHECK TIMING CHAIN INSTALLATION

Check timing chain installation. Refer to

EM-54, "TIMING CHAIN"

OK or NG

>> GO TO 17.

>> 1. Repair the timing chain installation.

2. GO TO 4.

CVT:

650

50 rpm (in "P" or "N" position)

CVT:

650

50 rpm (in "P" or "N" position)

CVT:

BTDC (in "P" or "N" position)

BASIC SERVICE PROCEDURE

EC-59

Revision; 2004 April

2003 Murano

17.

DETECT MALFUNCTIONING PART

Check the following.

●

Check camshaft position sensor (PHASE) and circuit. Refer to

EC-328

●

Check crankshaft position sensor (POS) and circuit. Refer to

EC-322

OK or NG

>> GO TO 18.

>> 1. Repair or replace.

2. GO TO 4.

18.

CHECK ECM FUNCTION

Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but
this is the rarely the case.)

Perform initialization of NVIS (NATS) system and registration of NVIS (NATS) ignition key IDs. Refer to

BL-189, "ECM Re-communicating Function"

>> GO TO 4.

19.

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) SIGNAL

With CONSULT-II

Run engine at about 2,000 rpm for about 2 minutes under no-load.

See “HO2S1 MNTR (B1)” in “DATA MONITOR” mode.

Running engine at 2,000 rpm under no-load (The engine is
warmed up to normal operating temperature.), check that the
monitor fluctuates between LEAN and RICH more than 5 times
during 10 seconds.

OK or NG

>> GO TO 21.

NG (Monitor does not fluctuate.)>>GO TO 23.
NG (Monitor fluctuates less than 5 times.)>>GO TO 31.

20.

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) SIGNAL

Without CONSULT-II

Stop engine and set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to

EC-85,

"HOW TO SWITCH DIAGNOSTIC TEST MODE"

Start engine and run it at about 2,000 rpm for about 2 minutes under no-load.

Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.),
check that the MIL comes on more than 5 times during 10 seconds.

OK or NG

>> GO TO 22.

NG (MIL does not come on)>>GO TO 23.
NG (MIL comes on less than 5 times)>>GO TO 31.

1 time:

RICH

→

LEAN

→

RICH

2 times:

RICH

→

LEAN

→

RICH

→

LEAN

→

RICH

PBIB0120E

EC-60

BASIC SERVICE PROCEDURE

Revision; 2004 April

2003 Murano

21.

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL

With CONSULT-II

See “HO2S1 MNTR (B2)” in “DATA MONITOR” mode.

Running engine at 2,000 rpm under no-load (The engine is
warmed up to normal operating temperature.), check that the
monitor fluctuates between LEAN and RICH more than 5 times
during 10 seconds.

OK or NG

>> INSPECTION END

NG (Monitor does not fluctuate.)>>GO TO 24.
NG (Monitor fluctuates less than 5 times.)>>GO TO 31.

22.

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL

Without CONSULT-II

Switch the monitored sensor from bank 1 to bank 2. Refer to

EC-85, "How to Switch Monitored Sensor

From Bank 1 to Bank 2 or Vice Versa"

Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.),
check that the MIL comes on more than 5 times during 10 seconds.

OK or NG

>> INSPECTION END

NG (MIL does not come on)>>GO TO 24.
NG (MIL comes on less than 5 times)>>GO TO 31.

23.

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) HARNESS

Turn ignition switch "OFF" and disconnect battery ground cable.

Disconnect ECM harness connector.

Disconnect heated oxygen sensor 1 (bank 1) harness connector.

Check harness continuity between ECM terminal 35 and heated oxygen sensor 1 (bank 1) terminal 1.
Refer to Wiring Diagram,

EC-225, "BANK 1"

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 25.

>> 1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 1).

2. GO TO 4.

1 time:

RICH

→

LEAN

→

RICH

2 times:

RICH

→

LEAN

→

RICH

→

LEAN

→

RICH

PBIB0120E

Continuity should exist.

BASIC SERVICE PROCEDURE

EC-61

Revision; 2004 April

2003 Murano

24.

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) HARNESS

Turn ignition switch "OFF" and disconnect battery ground cable.

Disconnect ECM harness connector.

Disconnect heated oxygen sensor 1 (bank 2) harness connector.

Check harness continuity between ECM terminal 16 and heated oxygen sensor 1 (bank 2) terminal 1.
Refer to Wiring Diagram,

EC-227, "BANK 2"

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 25.

>> 1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 2).

2. GO TO 4.

25.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

Reconnect ECM harness connector.

Perform

EC-63, "Accelerator Pedal Released Position Learning"

>> GO TO 26.

26.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform

EC-64, "Throttle Valve Closed Position Learning"

>> GO TO 27.

27.

PERFORM IDLE AIR VOLUME LEARNING

Refer to

EC-64, "Idle Air Volume Learning"

Is Idle Air Volume Learning carried out successfully?

Yes or No

Yes (With CONSULT-II)>>GO TO 28.
Yes (Without CONSULT-II)>>GO TO 29.
No

>> 1. Follow the instruction of "Idle Air Volume Learning".

2. GO TO 4.

28.

CHECK "CO"%

With CONSULT-II

Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.

Turn ignition switch "OFF", wait at least 10 seconds and then turn "ON".

Select "ENG COOLANT TEMP" in "ACTIVE TEST" mode.

Set "ENG COOLANT TEMP" to 5

C (41

F) by touching "DWN"

and "Qd".

Start engine and rev it (2,000 to 3,000 rpm) two or three times
under no-load, then run engine at idle speed.

Check "CO"%.

OK or NG

>> GO TO 31.

>> GO TO 30.

Continuity should exist.

Idle CO: 0.7

−

9.9% and engine runs smoothly.

SEF172Y

EC-62

BASIC SERVICE PROCEDURE

Revision; 2004 April

2003 Murano

29.

CHECK "CO"%

Without CONSULT-II

Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.

Turn ignition switch "OFF".

Disconnect engine coolant temperature sensor harness connector.

Connect a resistor (4.4 k

Ω

) between terminals of engine coolant

temperature sensor harness connector.

Start engine and rev it (2,000 to 3,000 rpm) two or three times
under no-load, then run engine at idle speed.

Check "CO"%.

After checking "CO"%, turn ignition switch "OFF", disconnect the
resistor from the terminals of engine coolant temperature sensor
harness connector, and then connect engine coolant tempera-
ture sensor harness connector to engine coolant temperature
sensor.

OK or NG

>> GO TO 31.

>> GO TO 30.

30.

RECONNECT HEATED OXYGEN SENSOR 1 HARNESS CONNECTOR

Turn ignition switch "OFF".

Reconnect heated oxygen sensor 1 harness connector.

>> GO TO 34.

31.

REPLACE HEATED OXYGEN SENSOR 1

Stop engine.

Replace heated oxygen sensor 1 on the malfunctioning bank.

With CONSULT-II>>GO TO 32.
Without CONSULT-II>>GO TO 33.

32.

CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL

With CONSULT-II

Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.

See "HO2S1 MNTR (B1)/(B2)" in "DATA MONITOR" mode.

Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.),
check that the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.

OK or NG

OK >> GO

>> GO TO 34.

Idle CO: 0.7

−

9.9% and engine runs smoothly.

SEF982UA

1 time:

RICH

→

LEAN

→

RICH

2 times:

RICH

→

LEAN

→

RICH

→

LEAN

→

RICH

Nissan Murano Z50 (2003 year). Manual - part 83